Paul, I don't understand your question. Editors edit. That's what they do.
Student or Learner
Why should the editor change the first draft words and or the last draft words when editing? What makes the editor use there words over the writers? Like being politically correct? What makes these corrections so special against the first draft and last draft? Spelling is my first enemy and finding the correct words to use in a sentence is my second. I just figured out why the subject is the subject and the predicate is the second. Edit please.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
They may also be applying rules from their style guide that the writer is not aware of.